WEIGHT

Weight is the most critical factor in determining casting part cost. Unnecessary mass should always be removed by correct engineering practices to reduce part weight.

RISER

When possible, a single riser on one part should be considered. This will generally yield higher casting come-out-rate.

CASTABILITY

If the design contains features that will raise scrap or rework rates (and the piece price), QS Engineer will recommend design modifications to keep the piece price down.

MATERIAL SELECTION

Elements like Nickel and Molybdenum is very expensive and price is uncertain while Chromium is much cheaper in china. Therefore, for some alloy steels, “Cr” would be a best choice in stead of “Ni” and “Mo” contained in material if mechanical properties can meet your requirements.

Recommend 20Cr, 40Cr used.

HEAT TREATMENT

Properties of hardness, mechanical, corrosion resistance, and surface treatments are achieved by Heat treatment Unless otherwise indicated, all plain carbon steel & iron are quoted without H-treatment charges, all alloy steels are quoted with a normalize or Q+T. All 300 series stainless steels are quoted with a solution anneal. A cost savings is generated if the casting can be used in the as-cast condition.

STRAIGHTENING

Straightening adds cost, but sometimes cannot be avoided. The actual straightening costs are often dependent on the tightness of the tolerance specified, so do not specify tighter flatness, straightness, roundness, or other requirements than you actually require. ( QS straightens parts using die sets and press machine that will increase piece price.)

NDT

Sample castings are non-destructively tested by MPT & FPT and selectively by X-Ray in order to establish right pouring-gate system.

However, this is generally not required in batch production; doing so will add costs. The following non-destructive tests are listed from least to greatest cost:

1. Magnetic Particle

2. Fluid Penetrant

3. X-Ray